Already this year 11 WA taxi drivers have been banned for incidents involving sexual assault.
Already this year 10 WA taxi drivers have been convicted of sexual assault.
Some women type the driver's identification number into their mobile phone and send it to their partner; others make a phone call to let someone know they are on their way home.
While many passengers hop into a taxi after a night out without batting an eyelid, reports of sexual assaults have changed the way some people think about taking a taxi late at night.
Ten Perth taxi drivers have been convicted of sexual assault this year, on top of the 11 who were convicted last year.
During the nine months to March this year the Transport Department received 52 complaints about sexually inappropriate behaviour.
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Of those, 43 were about conversations of an inappropriate nature and nine were about incidents of inappropriate touching of a passenger.
So far this year 10 taxi licences have been cancelled following allegations of sexually assaulting a passenger.
Four have also been suspended while matters were resolved.
In 2011, 11 taxi licences were cancelled and seven were suspended.
Kym Daffen, a psychologist from Midland Women's Health Care Place said many of her female friends no longer used taxis as a form of transport because of the reports of sexual assaults.
She recommended women not get into a taxi if they had been drinking alcohol.
"If it is happening so often, it seems the drivers are being opportunistic and if you are intoxicated, that's really dangerous," Ms Daffen said.
She said women should have a plan when they were having a night out that might involve catching a taxi.
Ms Daffen advised taking a photo of a taxi driver's identification card and sending it through to a friend or phoning someone when getting into a taxi to let them know how far you are away.
"Stick to that plan and watch out for your girlfriends. If you do hop into a taxi after drinking, make sure you have a friend with you," she said.
Transport Minister Troy Buswell did not say whether he was concerned about the complaint statistics but instead said the high number of cancellations was evidence of the government's commitment to weeding out the bad apples in the taxi industry.
"Already this year more T-extensions [taxi licences] have been cancelled than the total for each of the past three years," he said.
"Those drivers who have lost their T-extension have done so as a result of the application of the character test and also as a result of improved processes between the Department of Transport and WA Police to ensure (the Department of Transport) is aware of any character-related offences and complaints."
There are 2,152 taxis operating and 5,488 taxi drivers registered to operate in Perth.